1999959 has 16 divisors (see below), whose sum is σ = 3024000. Its totient is φ = 1165536.

The previous prime is 1999957. The next prime is 1999969. The reversal of 1999959 is 9599991.

It is not a de Polignac number, because 1999959 - 2¹ = 1999957 is a prime.

It is an Ulam number.

1999959 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 609 + ... + 2090.

It is an arithmetic number, because the mean of its divisors is an integer number (189000).

2^1999959 is an apocalyptic number.

1999959 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1999959 is a deficient number, since it is larger than the sum of its proper divisors (1024041).

1999959 is a wasteful number, since it uses less digits than its factorization.

1999959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2734.

The product of its digits is 295245, while the sum is 51.

The square root of 1999959 is about 1414.1990666098. The cubic root of 1999959 is about 125.9912440376.

The spelling of 1999959 in words is "one million, nine hundred ninety-nine thousand, nine hundred fifty-nine".